Increase of carbon dioxide in the bottom water of the Weddell Sea, Antarctica


Contact
efahrbach [ at ] awi-bremerhaven.de

Abstract

High precision total CO2 (TCO2) data are presented from the NW Weddell Sea obtained during two cruises which were 3 years apart. A TCO2 increase from 1993 to 1996 was observed in the newly formed bottom water, whereas no TCO2 increase was found in the surrounding water masses. Accompanying this TCO2 increase in the bottom water was an oxygen decrease. Obviously, bottom water with variable characteristics is produced along the margins of the Weddell Sea. Examination of possible causes leads to the conclusion that the bottom water variability is largely due to varying amounts of Warm Deep Water intruding onto the shelves of the Weddell Sea, thus changing the shelf water end-member of bottom water formation. Analysis of the data, using the observed differences of oxygen to perform a correction, suggested that some part of the TCO2 increase of the bottom water is due to the increased level of anthropogenic CO2. The TCO2 increase of the bottom water is commensurate to a tentative annual increase of about 1 μmol kg-1 in the surface water source of this bottom water. This would agree fairly well with the increase of the partial pressure of CO2 in tile atmosphere.



Item Type
Article
Authors
Divisions
Programs
Publication Status
Published
Eprint ID
1427
DOI https://www.doi.org/10.1016/s0304-4203(97)00094-7

Cite as
Hoppema, M. , Fahrbach, E. , Stoll, M. H. and de Baar, H. J. (1998): Increase of carbon dioxide in the bottom water of the Weddell Sea, Antarctica , Marine Chemistry, 59 (3-4), pp. 201-210 . doi: https://www.doi.org/10.1016/s0304-4203(97)00094-7


Share


Citation

Research Platforms

Campaigns
ANT > X > 7
ANT > XIII > 4


Actions
Edit Item Edit Item